Draft-regulator



(No Model.)

0. D. HOWARD.

DRAFT REGULATOR. No. 491,752. 7 Patented Feb. 14, 1893,

WITNESSES: I N VE N TOR amd a. W

! l i Q Nrrn STATES PATENT OFFICE.

CHARLES D. HOWARD, OF SYRACUSE, NE\V YORK.

D RAFT- REG U LATO R.

SPECIFICATION forming part of Letters Patent No. 491,752, dated February 14, 1893.

Application filed November 16, 1891. Serial No. 412,040- (No model.)

To all whom it may concern.-

Be it known that 1, CHARLES D. HOWARD, of Syracuse, in the county of Onondaga, in the State of New York, have invented new and useful Improvements in Draft-Regulators, of which the following, taken in connection with the accompanying drawings, is a full, clear, and exact description.

The invention relates to certain improvements in automatic draft regulators for heating apparatus; and it has for its objects to provide an improved damper and mechanism for operating the same, to simultaneously control the draft to the ash-pit and the escape fines of the furnace, and thus automatically regulate the combustion of the fuel, as more fully hereinafter set forth.

To this end the invention consists of a cylindrical damper, arranged to partially rotate in a suitable casing, the damper being divided by a partition, into two chambers, the walls of which are longitudinally slotted the casing also having similar slots so situated, in respect to the slots in the damper-cylinder, that while the slots leading to one chamber of the cylinder are closing those leading to the other are opening, and vice versa.

The invention further consists in the combination with the doubled chambered damper and easing, of thermostatic devices whereby the damper is automatically operated by changes of temperature in the room in which the thermostat is situated as more fully hereinafter explained.

In the accompanying drawings forming part of this specification-*Figure 1 represents a side elevation of a furnace with my improved damper connected to the pipes thereof, and showing the thermostatic devices located in an apartment above the furnace; Fig. 2, a longitudinal, vertical section of the damper; Fig. 3, a side elevation of a modified form of the damper; Fig. 4, a transverse section of the same, and Fig. 5, a vertical section of the thermostat.

Referring to the drawings, similar reference numerals indicate similar parts throughout the several views, in which- The numeral 1 indicates a cylindrical casing in which is fitted a partially rotating damper-cylinder, 2,which is provided with a shaft, 3, projecting at one end. To the outer end of the projecting shaft is secured an arm, 4, by which the damper cylinder is partly rotated or oscillated. The said cylinder is divided into two chambers or compartments; by means of a diaphragm, 7, and the walls of the respective chambers are slotted longitudinally to form air-passages for the draft. The casing is also slotted, as indicated in the drawings, the slots of the dam per-cylinder and those of the casing being so disposed, respectively, that while the slots in the wall of one chamber of the damper-cylinder are opening, those in the other are closing. From the casing extend two pipes 9 and 10, one of which leads to the ash-pit of the furnace and the other to the escape fine, so that while the draft to the ash-pit is being opened the draft to the escape-flue is being closed, and vice versa.

In the form shown in Figs. 1 and 2 of the drawings, the diaphragm is situated midway between the ends of the damper-cylinder, and the pipes 9 and 10 lead from opposite ends of the casing. In this case the slots in the said cylinder and the casing extend longitudinally from about midway to near the ends of said casing or cylinder, and those at one end are out of line, longitudinally, with those at the other, so that while the slots are opening on one side, they are closing on the other side of the partition to regulate the draft as before mentioned.

In the modification shown in Figs. 3 and 4, the pipes 9 and 10 lead from one end of the casing, and the diaphragm is situated longitudinally within the damper-cylinder.

The numeral 11 indicates the thermostat by which the damper is automatically operated. The said thermostat consists of a plate composed of two sheets of material having difierent expansible properties, preferably sheet iron and hard rubber or vulcanite suitably united. The plate is attached at both ends to a support secured to the wall of the compartment in which it is to be placed, and, midway between its ends is provided with an adjusting screw, 12, which works through a threaded aperture in said plate. The inner end of said shaft bears against the short arm of a lever, 13, fulcrumed at 14, in the wall or support. The outer end of the adj ustingscrew is provided with a knob, 15, by which it may be turned, and with a pointer, 16, arranged to move over a segmental scale, for the purpose hereinafter explained. The long arm, 17, of the lever has attached to it one end of a chain or connection, 18, the other end being attached to the damper-operating-arm, as shown in Fig. 1 of the drawings.

The operation of theinvention will be readily V understood in connection with the above description. The thermostat is first set, by means of the threaded adjusting-screw, to move the damper when a predetermined tern perature is reached, which is indicated upon the scale by the pointer. When the tempera ture rises above the predetermined point, the rubber face of the thermostat plate expands, causing said plate to bulge outwardly, permitting the damper-cylinder to rotate sufficiently to partially or wholly close the draft to the ash-pit, and correspondingly open the draft to the escape flue, and thus retard com-' tition into two compartments, and slotted longitudinally as described, in combination with an inclosing casing also longitudinally slotted as described, and the pipes leading from the casing to the ash-pit and escape-fines, respectively. 7

2. The combination, with the outer casing, of the damper-cylinder arranged to rotate within said casing, the dividing partition located between the ends of said damper-cylinder and the pipes leading from opposite ends of the casing to the ash-pit and escape-flue of the furnace, the casing and damper-cylinder being longitudinally slottedat each end,'the slots at one end being longitudinally out of line with those at the other, substantially as specified. j

3. The combination with the damper-cylim der having two compartments, and the casing within which it'is arranged to rotate, the cylinder and easing being slotted as described, the pipes leading to the ash-pit and escapeflue of the furnace, the lever connected with the damper operating-arm and the thermostat, whereby said lever is actuated to operate the damper-cylinder, substantially as and for the purpose set forth.

In witness whereof I have hereunto set my hand this 12th day of November, 1891.

O. D. HOWARD. In presence of HOWARD P. DENISON, O. B. KINNE. 

